diff --git a/idea/src/org/jetbrains/kotlin/idea/actions/JavaToKotlinAction.kt b/idea/src/org/jetbrains/kotlin/idea/actions/JavaToKotlinAction.kt
index 3b8938ce1a7..c33edcead5e 100644
--- a/idea/src/org/jetbrains/kotlin/idea/actions/JavaToKotlinAction.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/actions/JavaToKotlinAction.kt
@@ -89,7 +89,7 @@ public class JavaToKotlinAction : AnAction() {
 
             val newFiles = saveResults(javaFiles, converterResult!!.results.map { it!!.text /*conversion of a file always succeeds*/ })
 
-            externalCodeUpdate!!.invoke()
+            externalCodeUpdate?.invoke()
 
             newFiles.singleOrNull()?.let {
                 FileEditorManager.getInstance(project).openFile(it, true)